GAS: A Group Acknowledgement Strategey in Internet of Vehicles

The Internet of Vehicles (IoV) has been applied for guaranteeing road safety, improving traffic efficiency, and providing entertainment services in the smart city systems. However, due to the dynamic characteristics of IoV, for example unstable topology, high mobility, intermittent connectivity, the data dissemination especially for large files fetching, is hard to design on the basis of the traditional End-to-End transmission mode. To address this issue, we presents a Group Acknowledgement Strategy (GAS) in this paper, to change the End-to-End mode to the grouping transmission mode, by which the file fetching speed can be greatly improved in IoV. In addition, by introducing the Group Acknowledgements (GACK) to reply multiple segments with only one frame, the average latency during file dissemination can be significantly reduced. In this way, the speed for file transmission can be further increased. Numerical results show that our GAS could outperform the traditional ACK and no-ACK schemes in terms of throughput, latency, packets delivery ratio as well as packets loss ratio.

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